Will a PCI Express x16 3.0 card work in a PCI Express x16 slot? [duplicate]

Solution 1:

Quoting wikipedia:

PCI Express 3.0 Base specification revision 3.0 was made available in November 2010, after multiple delays. In August 2007, PCI-SIG announced that PCI Express 3.0 would carry a bit rate of 8 gigatransfers per second (GT/s), and that it would be backward compatible with existing PCIe implementations.

Emphasis is added.

So yes, the card will work in the slot, but as nerdwaller mentioned, you may not get full performance depending on the resolution or framerates you're aiming for.

Solution 2:

You should try researching this a bit before asking, but it should work fine.

The issue would be if you are trying to hit really high resolutions. Just verify that the BIOS on your MOBO is up to date (check the version history to see if it's needed before needlessly flashing it).